In Bristol-Myers Squibb Co. v. Superior Court of California, San Francisco Cty., the U.S. Supreme Court established limitations on personal jurisdiction over non-resident defendants in “mass actions,” effectively supporting the view that plaintiffs cannot simply “forum shop” in large class and collective actions and instead must sue where the corporate defendant has significant contacts for purposes of general jurisdiction or limit the class definition to residents of the state where the lawsuit is filed.  Notably, the Supreme Court’s decision was limited to personal jurisdiction issues in state courts, which has led to a split on the question of whether, and to what extent, the Supreme Court’s analysis applies to class and collective actions pending in federal court. 
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